Rotary pump.



T. J. PAGEL.

ROTARY PUMP.

APPLICATION FILED Nov.11,1|\2

1 ,085290, Patent-ed Jau. i2?. 1.9i 'g .4 SHEETS-SEULE 1 l WMM E. J. PAGEL.

ROTARY PUMP.

APPLICATION FILED Nov. 11,1912,

l ,085,290. Patented J an. 52'?. 1914.

MMM

T. J. PAGEL.

ROTARY PUMP.

APPLICATION FILED No\i11,1912.

LQO. Patented Jan. 27, 1914 4 SHEETS-SHEET 3.

O i 416 (ff/anfing T. J. PAGEL.

ROTARY PUMP.

APPLICATION FILED Nov. 11. 1912.

Patented J an. 27, 1914.

4 SHEETS-SHEET 4.

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In Lp' THEIODORE J. PAGEL. F MNNEPOLIS, MINNESOTA, ASSIGNOR TO PAGEL ROTARY -PUMP MANUFACTURING COMPANY, OF MINNEAPOLIS, VINNESOTA, A CORPORA- TON OF MINNESOTA.

Specification of Letters Patent,

ROTARY PUIMP.

lfa'tented l nin-2 1 91 Application tiled November 1.1. 1912. Serial No. 730,839.

To Utl /r/zom if muy (jouwe/'n Be it known that iI, '.l`nnoDo1u-i Ji. PAGHI., a. citizen t the United States. residing at Minneapolis, in the county ot Hennepin and State ot Minnesota. have invented certain new and uset'ui improvements in Rotary lnmps; and I do hereby declare the 'following' to he a full, clear, and exact description ot the invention, such as will en able others skilled in the art to which it apiiertains to raalte, and use the same.

My invention relates to rotary pumps, and has for its object. to improve the oonst uetion and. increase the etliciencyv oit pumps of this type.

Particularly, the invention has for its ohject to provide an .improved multiplex rotary pump, and means wherebyv` when a large volume ot vtiter is desired. several pumps may he sin'iultaneonsly operated from a Common source ol energy, and when relatively nich pressure, but less volume ot water is desired. any one, or less than the whole number ot' pumps may he thrown out ot' action and the entire (flriving` 'toreo ntilized to drive the same. Y

Generally stated, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

In the accompanying drawings which illustrate the invention. like characters indicate like parts throughout the several views.

Referring to 'the drawings, Figure l is a plan View of the improved pump with some parts broken away; Fig. 2 is a jt'ront eleva tion thereof; Fig. 73 a side elevation ol' the pum i. some parts being broken away; lvig. -t is a vertical section taken ou the line a14 tu* on Fig. Fig. 5 is a horizontal section taken on the line tri' .es on Fig. 2; and Fig. ti is a vertical section taker. on the line or; '.ron Fig. 5.

The main easing' of the pump is pret'en ably made up ot an intermediate section l and end sections 2. which parts are bolted together. or otherwise connected with water tight joints. Near the ends ot the section l. this easingA is toi-med with intersecting cylindrical piston chambers or seats Yl'. and. at its ventral portioii, the said section l is torni-od witl n tubular `gear housing- 5 that extends through the same( troni lront to rear, but has no etmununication with the interior ol said casing. Just below the housing i, the case section l is formed with a cylindrical valve seat G that opens into the two compartments a. and o ot the main easi ing through ports C and t57 (see Fig'. o). llf'orlfing in the valve seat t3 is a segmental rotary valve 7, which, at one end has a head S that` closes the end of the valve seatv ti and is connected to an operating cranl: f) (see Fig. l). The other end of the valve seat is connected to a water supply7 pipe 10 and this saine end of the valve 7 is open. so that the 'water tlows directly into the said valve seat, and from thence, through one or the other or tl rough both ot' the ports "a and G into one or the other or both ot the main compartments a und I) of the casing. Horizontal partitions tl (sec Fig. 6) divide the` compartments a and b of the casing intoupper and lower sections. Below the partitions ll, the sides of each piston seat '-l arc provided with inlet ports 4 and ahove said partitions ll, both sides of each piston seat, 1l are provided with outlet ports -t The upper sections ol' the compartments f1 and o, on opposite sides of a contrai upper partition l2, are provided with discharge ports 13a and 13 that are normally closed by lightly spring-pressed upwardly opening cheek valves lst, located in a discharge chamber bolted or otherwise rigidly secured with a water tight joint to the top ot the main easing. rl`his discharge chamber l5 is shown as provided with discharge passages 16", and with a threaded neck .l to which latter an air chamber, not shown, is adapted to be connected. In each horizontal partition ll is a by-pass port 17 that is normally closed by a sti-called lay-pass valve 1S, shown as provided with a threaded stem t9 working in the top of the correspending euse section 2.

iVm-king in he intersectingv cylindrical piston seats l arc rotary gear-like pistons 20, each ot which. as shown, has two diamotrieally opposite teeth or propelling lugsl Il and two diannjftrieally opposite lug seats 22. Ut course, the number ot these propet line; lugs and seats may be varied. The propeilingY lugs Z1 work with close engagement with the sides and peripheral walls of the respective seats 4; and are dapted to engage in the proper order with the so-called lug,` seats 2Q ot cooperating rotary pistons. The hase portions of the propelling lugs 21 iwy are preferably struck en' a. curve of greater arc than are the outer portions of the said lugs. This gives the wearing Contact at the base of said lugs and Igives clearance between the more inwardlyextended curved surfaces and the walls of the lug seats 22. The bottoms of` the said lug seats Q2 (see Figs. 4t and 5) are formed with laterally spaced approximately straight ribs 2Oa and with interveningy channels h. The ends of the propelling lugs 21 and the outer extremities of the packing blades 25 engage with the said ribs 20 and the channels 20 afford. ample opportunity for water to escape from one side to the other of the packing strips and the outer extremities of' the said lugs, thereby preventing the water which is caged in the lug seats .32 from locking` or blocking the movement of the rotary pistons.

The solid portions of the bearings 27 (see `Figs. 2l and immediately adjacent to the rotary pistons 20 are formed with annulaigrcoves 2Ta that are connected hy small re turn ducts 27 to the suction sides, that is,

to the lowersections of the compartments 1f -and 71 of the easing, so that. any water which leaks into thesa-id grooves 27a will be thrown haelt into the casino'. This very greatly reduces the pressure of the waterat the jourA nals and correspondingly reduces the tendency toward leakage. Preferably, the said pistons 2O are formed adjacent to the bases of their lug seats 2l with depression 23, .to receive projecting ribs 24 formed on the eoopcrating partitions adjacent .to the lug seats 22. This extends the operative surface of the propelling lugs inward of their pitch lines and forms a better vjoint for preventing leakage of water between the engaging propelling lugs and seats. The propelling lugs are preferably formed on the line of involute curves, but may be formed orrany other desirable carros which will give a good gear action. 'lhe propelling lugs may be and preferably are provided with packing strips which form close engagement with the cylimlrical walls of the piston seats.

Each cooperating rotary piston 20, on one side, is axially aliued with a corresponding pisloiron tin` other side of the easingyund these :ziially alim-d pistons are rigidly 'secured to common shafts Q6 journaled in suitable lbearings QT and extended tliriiugh suitable ritulling boxes on the main casing. The bearings?? are preferably roller locarings (sce particularly Fig. in which Vier.-v some of the roller bearings are ren'ioved and others are shown in position. lhe shafts 26 are` of course, parallel to each other and I Aboth extend transversely tlirough the gear housing 5, Yan-zl within the said. housing, they are provided with rigidly secured intermeshing pinions 23,' which cause the several rotary piste?- "to move in synchro- Loenen@ nism. These gears Q8 take the main driving friction and relieve the cooperatingl rotary pistons from wearing friction, One of the shafts 2li is extended one end and pro-` vided with va driving element shown in the Aform of a pulley L29, over which a power driven belt, not shown, is adapted to be run toimpart rotary movements to the coperating pistons. Preferably, the case sections l'see particularly Figs. l and` 5), are provided with outer shaft bearing' lugs 30 in which also ball hearing` devices, not showin. are adapted to be applied, to aii'ord `good supports for the outer ends of the shafts 2G.

The operationof. this improved pump is substantially follows: When the bypass ports 't7 are closed by the bypass valves 18, the only communication between the upper and lower portions of the compartment a," or of the compartment Z), is through the piston seats fl, and to carry water through these piston seats 4, rotary movements of the pistons are required. As is evident., when theadmission valve 7 is in the position shown in Fig. and the pistons are then rotated in 'the direction of the arrow marked on Fig. 4,

both of the rotary pumps will simultaneously act to pump water in a direction from the supply pipe 1t), out through the. neck 16 of the discharge chamber l5. The valves 14 are so lightly seated that they offer lvery little resistance to the flow of the water, but nevertheless, they check a reverse flow when the pumps are idle. When the valve 7 is turned toward the left, so as to close the porty (la, only the right hand pump will be in aetion, and on the other hand, when the saldil valve is turned 'toward `the right, so as to'i close the port El, only the left hand pump will be thrown into action. lVhen one ofY the rotary pumps is thrown out of action, thc lay-pass valve 18 on that side of the the pump casing. should be openedvup so that water. cagedin that closed side of the easing will be free to circulate through the coperating by-paSs port 17, T his prevents eX- cessive resistance d ue to rotation of the idle or iin-operative pump. bviously, whe only one pump is in action, only one-halfas much water will be pumped as 'when both pumps are in action, but all of rthe driving force is then available on one pump', so that water can then be' delivered under approximately twice as much pressure and approximately twice as greatan altitude as when both pumps arein action. `The pump illustrated is a duplex or twin rotary pump, but it will, of course, be under stood'that. the. pump maybe made in more than two sections, and', furthermore, that many of the features yof this invention are pump easing, to-wit, on the closedfsidc of"l capable of use in a single or simple'rota1v-.1 .k

addition to the provision made for the tree @scape of the fluid trapped Vbetween the intermeshing teeth, will greatly increase the Capacity and etiiciency of this pump over the ordinary rotary pump, where the vater is forced to enter from below in a direction di rectly opposing the rotating propellers. lith this old construction the momentum of the inrushing water striking against the propellers moving in the opposite direction, exerts a strong reacting torce against the rotation of the pistons. The piston or propeller teeth are called upon to suddenly ar-A restthe rush of water against them. divert the stream first backward .and then in two opposite directions at right angles to the original flow. This action entails a considerable loss ot' power. in the ordinary rotary pump, especially when pumping from hydrants under pressure as a tire engine pump. It also increases the slippage and decreases the capacity of the pump, as the tooth spaces are apt to be incompletely filled with water. On the outlet side of the ordinary pump there are no means, whereby the water.y that -is forced out of the tooth space when the tooth enters, can escape sidewise, to the outlet port, but it must be forced backward out between the entering tooth and the cavity walls, and when the tooth closes in the space Vor cavity, the remainingr water caninot escape in that direction at all, but ispropelled with great force against the side walls ot' the pump, consuming power and sometimes even resulting in breakage. This defeet is entirely obviated in the applicants improved pump. as the outlet ports are in the side walls of the pump casing, and these ports are both in free communication with the tooth cavities of the pistons up to the point where the greatest displacementhas taken place. The water remaining in the clearance spaceis released from pressure and the water displaced by the innieshing tooth is discharged freely in both sidewise directions from the tooth space into the lateral outlet ports, under normal p sure. lt will be seen therefore. that this peculiar con struction and location of both the intake, and discharge ports adds greatly to the etiiciency. capacity and smooth ruiming ot' the pump. The ports areflocated at'fopposite sides of a line d awn through the centers ot the pistonsfand the distance between them across this center line, is substantially the width ot a tooth or a tooth cavity. with a slight lap.

` In this pump, two or more distinct pumping units are provided, and the whole torce of the primary power may be concentrated on one or more of the units by operation ot' the admission valve 'i'. When the admission is shut oil' trom onel unit the added pressure resulting from a continued operation of the remaining pump or pumps, acts to close the check valve 14 ot the inoperative pump and ments ot' the inoperative pump to circulate .freely within the compartment. The valves 1S are not emergency or check valres to pro vent injuryY or rupture. because the check valves l-i will prevent this. but the said Valves lt. act simpl)Y to prevent unnecessary back pressure on the idle ruiming pump.

rl`his improved pump is ot simple com struction. oll comlnirativcly small cost, has tow parts to get out ol order and is highly ei'licient .tor the purposes had in viewwhat l claim is:

l. 'lfhc combinationI with a casing pro vided with inici-stating ovlindrical piston` chambers. ot cooperating rotary pistons working within the said chambers. the said pistons having peripheral tooth members` and cooperating tooth cavities arranged alternately and ext-ending across the peripheryY o'l thi` said pistons to the side walls ot' .the said piston chambers. .means arranged in both sides ot the said pistons and in both sides et the said chambers tor admitting water in a'latcral direction into the said tooth cavities', and an exhaust port leading from the said cylindrical piston chambers.

2 The combination with a casing provided with intersecting c \f'limlrical piston chambers. ot' cooperating rotary pistons working within the said chambers. the said pistons haring peripheral tooth members and cooperating tooth cavities arranged :1%- ternately and extending across the periphcrj of the said pistons. means arranged in both sides ot' the said pistons and inboth sides of the said chambers` `tor admitting water in a lateral direction into the said tooth cavities and fcr discharging' the water, ina lateral direction. from the said tooth c itities and from the said piston chambers.

3. The combination with a casing having intersecting cylindrical piston chambers, of rotaryv pistonsl working in said chambers and haring intcrmeshing peripheral teeth, said casing having admission poorts opening into said intersecting piston chambers through both sides ot the intersecting p'ortions ot the sides thereof, and at points past which the teeth ot said pistons sweep under f.

a compartment divided into upper and lower sections, and provided with intersecting` cylindrical piston chambers, ot rotargiy `pistons- Working in said chambers and having inter# meshing peripheral teeth, said casing having .admission and exhaust ports that -open into said piston chambers through both sides thereof,l at thel intersections of said piston chambers andA :it points past which the teeth of said pistons sweep under rotation of said pistons. y

6. The combination in a system of niultiple pumping units, having separate intersecting eylii'idrical piston Chambers and iiiternieshing rotary pistons Working Within the Said ('hambers, of admission and exhaust ports leading, respectively, to and from the said piston chambers, a Water supply ooncluit having branch connections to the admission ports of the several pumping units, a throttle valve at the junction of said supply conduit and its branches, movable into one position to admit Water to the several admisf' Asion ports and movable into another position to shut the Water oil from ono" of the said admission ports while adiiiittiiigrwater to another admission port, and al cheek valve arranged in one of the exhaust ports to tiitoinativally prevent the Water from entering the piston chambers of the pumping unit, the

admission port off-which has beensliut oll.

7. The combination in a system ot' multi'- s ple pumping units, having separate intersecting cylindrical pistonrhainbers and intermeshing i'otarypistons, Working Within the said chambers, of admission and exhaust ports leading, respectively, to and from the said piston chambers, a water supply conduit li'aif'iiig bran-:fh connections to the admission port-s of the several pumping units, a throttle valve at the junction of said suppl)r con-y duit and its branchesyinoiaible into one'pofiA sition to admit water'to the v.several admission ports and movable into another .position to shut/the water oill fromfone of thesaidy adinissionpoi-ts while a diniitiiig` Water to :ni-'f v other adiiiision port, a check Ialrearranged iii one ot the exhaust ports toaiitomaticallyf' prevent .the water Vfrom entering the piston Chambers of the puiiipinfunit, the admission port ot' which yhas been shut oli', and" normally closed `ValVe-fcq'i/iipperl by-piissage eoiineoting'the a'diiiissioii and exhaust ports of the respective puiiipilnits.

8. The coii'ibinatioi-i- Withafcasing having :i

' coiiipartmen't dividetl'into lippen; and lower sections, and provided With-*intersecting oy-A Working in said chambers and having intermeshing peripheral teietlnsaid easing hav- 6G chambers and at points past which the teeth and oiitlet.- poi laterally 'spaced ribs .of said lug seats, suit `Witnesses z lindrieal piston 4ohaiiibers,v c 'i'fiotarypistons torii'ieshiiig; propelling lugs said lug seats having laterally Spaced'i'ibs at of said pistons sweep under rotation ot' pistons, said easing having bet-Ween s admission and'exhaust ports a bridge that is Awider than the tangential width of the toot-h cavity of said pistons, whereby' lap is afforded to prevent leakage.

The combination with a casing having intersecting cylindrical piston seats 4'and in letand `outlet ports, of cooperatingrotary pistons working iii said seats and havin-g insaid termeshiiig propelling lugs and lug seats,

the said pistons at the baise of said" propeln ling liiff's hafving notches eitendiii i 'he bearing siiitaee's thereof inward ot'thopiteli line, I and having for eiigageiiieiit"thoieiiiith, ribs adjacent to the lug seats extent in g suriaoes outward of the pitch lino.

l0. The combination.'with a easing haring intersecting cylindrical pi; seats and in let and outlet ports, ot1v cooperatiiig rotary pistons u'orkingiiisaidase: and having in- 85 and lugv seats,

their bottoms and es tape passages-'between said ribs. suhstaiitiallv'as described.'

l1. 'lheoonihiiialien' with a easing having 90 intersecting cylindrical piston seats and inlet s,,oteoperating rotary pis tonsy Workiugiii*sa-id seats and haring interi'iiesliing'propelling lugs and lug seats, the

said lug seats having'laterally spaced ribs at 95 then-'bottoms and escape 4passages bet ven the sa ie, and the said propelling lugs having pue-,king blades engageable with the snijdt' stantiall),- as described.'

12, In a rotary pump, the combination 1with/a casing having intersecting cylindrical5 i pis/ ton seats and intermeshing rotary pistons i workiiigtherein, said pistons having shafts,

.and said case having bearings tor 'said 

